Chain hoist.



PATENTBD OCT. 6, 1903.

J. JOHNSON. CHAIN HOIST.

APPLIOATIOH rum) 001.21, 1902.

2 SHEETS-SHEET 1.

H0 MODEL.

No. 740,660. I PATENTED OCT. 6,1903.

J. JOHNSON.

GHAIN'HOIST.

APPLICATION FILED OUT. 27, 1902.

R0 MODEL. 2 SHEETS-SHEET 2.

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UNI-TED STATES:

' i'atented October 6, 1903:.

JOHN JOHNSON, OF DES MOINES, IOWA.

CHAIN Hols-r.

SPECIFICATION forming part of Letters Patent No. 740,660, dated October6, 1903.

Application filed October 27,1202. Serial No. 129,065. (N model.)

have invented a new and useful Chain Hoist,

of which the following is a specification.

The object of this invention is to provide improved means formultiplying the leverage on the lifting-pulley of a chain hoist and atthe same time furnishing means for locking said lifting-pulley againstreverse movement at any point in its revolution.

My invention consists in the construction, arrangement, andcombination'of elements hereinafter set forth,pointed out in my claims,and illustrated by the accompanying drawings, in which- Figure 1 is aface elevation of my device,

portions of the chain being broken away to economize space. Fig. 2 is acentral vertical section of the device. vation of the device. of thedriving-gear detached from the driven Fig. 5 is a detail view of thedrivinggear and parts rigidly connected therewith in edge elevation..Fig. 6 is a greatly-magnified view of the elements shown in the middlepart of Fig. 2.

In theconstruction of the device, as shown, the numeral 10 designates ahangerplate, and 11 a face-plate of the same size and shape as thehanger-plate and arranged parallel therewith. A plate 12 is mountedbetween the hanger-plate and face-plate, and an eye.-' clip 13 ismounted on and embraces the plates at their upper ends and is fixedthereto by a bolt 14:. It is the function of the eye-clip 13 to providemeans for suspending the device from a hook, bracket, or beam, (notshown,)

as is common in the use of hoists. A tongue 15 is formedon the lower endof the eye-clip 13 and extends outward and downward parallel with theouter face of the hanger-plate 10. A bolt 16 is mounted in andtransversely of the plates 10, 11, and 12, and a lifting-pulley 17 ofsprocket variety-is mounted for revolution on said bolt and arrangedparallel with the outer face of the hanger-plate 10. The lifting-pulley17 is of relative large diameter, and a lifting-chain 18 of sprocketvariety is mounted on the periphery thereof and engages its sprockets.The bight of the lifting- Fig. 3 is a rearele-i Fig. 4 is a detail viewchain 18 rests on and engages the sprockets of the lifting-wheel, andthe end portions of said chain are drawn toward each other to a distanceof separation materially less than the diameter of the wheel and dependvertically therefrom. The outer faces of the end portions of the chain18 run on and are confined byguide-blocks 19 20, fixed inobliquelyoonverging positions on the lower portion of the outer face ofthe hanger-plate 10. A

guide-plate 21 is fixed to the outer faces of the guide-blocks 19 20 andoverlaps the path of the chain 18 in contact with said blocks. Bolts 2223 serve to connect the guide-plate,

guide-blocks, hanger-plate, face-plate, and

inner plate 12. A hole 24: is formed in the hangerplate 10' below thewheel 17. The hole 24 is not circular, but is of a shape intermediate ofa circle and an equilateral trianglethat is to say, with three roundedcorners connected by arcs on a greater radius than. the corners. Acam-plate 25 of elliptical form is mounted in thehole 24:, and thelength of said cam-plate is approximately equal to the shortest diameterof the hole.

Pins 26 27 are mounted in and transversely of the cam-plate 25 and arespaced apart approximately the same distances as the sprock- 'ets of thewheel 17. The pins 26 27 are in alinement transversely of the cam-plate25 and are arranged to engage with the wheell? by embracing one oranother of .the sprockets "thereof between them. A head-piece 28 isfixed to the rear ends of the pins 26 27 and serves as a guiding-rim toconfine the wheel 17 at one point, the tongue 15 on the eye-clip l3confining said wheel at the diametrically opposite point. A hole 29 isformed in the plate 12 of materially greater diameter than the hole 24:and of the same general shape. A cam-plate 30 is fixed to or formed onthe cam-plate 25 and is mountedfor rotation in the -hole 29. Thecam-plate 30is elliptical in form and is arranged with its longestdiameter at right angles to the longest diameter of the plate 2.5. Ahole is formed in the faceplate 11, and a hub 31 of circular form ismounted loosely for rotation therein and formed on or fixed to thecam-plate 30. A driving-gear 32 of sprocket form is mounted .on the pins26 27 adjacent the hub 31 and is held in contact with said hub by a key33,

mounted in and transversely of the projecting end portions of said pins.A drivingchain 34 of sprocket character and of endless form is mountedon and engages with the sprockets of the driving-wheel 32. Aclip 35 ismounted on the outer face of the faceplate 11 and overlaps and confinesthe driving-chain and the top portion of the drivingwheel. A cross-bar36 is mounted on and connects the outer ends of the bolts 22 23 andcrosses and confines the driving-chain below the driving-wheel.

In practical use a loadis attached to one end of the lifting-chain 18and manual force is applied to the driving-chain 34 to rotate thedriving-wheel 32. The driving-wheel rotates with the cam-plates 25 andand the bearing therefor is provided by engagement of the peripheries ofthe cam-plates on the walls of the holes 24 and 29. Since the holes areof irregularcircularity,the center or axis of rotation of thedriving-wheel will varyand oscillate. Such provision is made in orderthat in the rotation of thedriving-wh'eel the pins 26 27 maysuccessively and evenly en gage successive sprockets of thelifting-wheel 17 and rotate the latter Wheel. In the rotation of thelifting-wheel the lifting-chain 18 is caused to travel longitudinallywith the periphery thereof and raise the weight attached thereto.A'reverse movement of the driving-chain will lower a weight attached tothe same end of the lifting-chain. The manual force may be withdrawnfrom the driving-chain at any time and the load will hang suspended bythe lifting-chain, the liftingwheel being locked against rotation underthe strain of the load by engagement of its sprockets with the pins 2627.

I claim as my invention- 1. The chain hoist comprising the drivingwheel,the endless chain thereon, the camplates connected with thedriving-wheel, the pins connected with the cam-plates and driving-wheel,the lifting-wheel arranged with one or another of its teeth inengagement with the pins and the lifting-chain on the liftingwheel.

2. The chain hoist comprising the hangerplate, the face-plate parallelwith the hanger- .plate, the plate 12 between the hanger and faceplates, the means for suspending the plates, the lifting-wheel mountedfor revolution on the plates, the lifting-chain on and engaging thelifting-wheel, the guides arranged to draw the depending portions of thechain toward each other, the cam-plates of elliptical form mounted withtheir longest diameters at right angles to each other and arranged forrotation in the plates on a varying axis, pins arranged parallel witheach other in and projecting from said cam-plates, projecting endportions of said pins contacting with teeth of the lifting-wheel,adrivinggear on said pins and an endless chain mounted on saiddriving-gear.

3. The chain hoist comprising the hanger,

the lifting-wheel thereon, the lifting-chain on the lifting-wheel, thedriving-gear arranged for rotation on a varying axis, means forconnecting the driving-gear to the lifting-wheel, which means serves asa lock for the lifting- Wheel at times, and a driving-chain on thedriving-wheel.

Signed by me at Des Moines, day of September, 1901.

JOHN JOHNSON.

Iowa, this 26th \Vitnesses:

S. 0. SWEET, W. E. ELLIS.

